.\" zip_open.mdoc -- open zip archive
.\" Copyright (C) 2003-2022 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP archives.
.\" The authors can be contacted at <libzip@nih.at>
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.Dd June 18, 2022
.Dt ZIP_OPEN 3
.Os
.Sh NAME
.Nm zip_open ,
.Nm zip_open_from_source
.Nd open zip archive
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft zip_t *
.Fn zip_open "const char *path" "int flags" "int *errorp"
.Ft zip_t *
.Fn zip_open_from_source "zip_source_t *zs" "int flags" "zip_error_t *ze"
.Sh DESCRIPTION
The
.Fn zip_open
function opens the zip archive specified by
.Ar path
and returns a pointer to a
.Ft struct zip ,
used to manipulate the archive.
The
.Fa flags
are specified by
.Em or Ns No 'ing
the following values, or 0 for none of them.
.Bl -tag -offset indent -width ZIP_CHECKCONS
.It Dv ZIP_CHECKCONS
Perform additional stricter consistency checks on the archive, and
error if they fail.
.It Dv ZIP_CREATE
Create the archive if it does not exist.
.It Dv ZIP_EXCL
Error if archive already exists.
.It Dv ZIP_TRUNCATE
If archive exists, ignore its current contents.
In other words, handle it the same way as an empty archive.
.It Dv ZIP_RDONLY
Open archive in read-only mode.
.El
.Pp
If an error occurs and
.Ar errorp
is
.Pf non- Dv NULL ,
it will be set to the corresponding error code.
.Pp
The
.Fn zip_open_from_source
function opens a zip archive encapsulated by the zip_source
.Fa zs
using the provided
.Fa flags .
In case of error, the zip_error
.Fa ze
is filled in.
.Sh RETURN VALUES
Upon successful completion
.Fn zip_open
and
.Fn zip_open_from_source
return a
.Ft struct zip
pointer.
Otherwise,
.Dv NULL
is returned and
.Fn zip_open
sets
.Ar *errorp
to indicate the error, while
.Fn zip_open_from source
sets
.Ar ze
to indicate the error.
.Sh ERRORS
The archive specified by
.Ar path
is opened unless:
.Bl -tag -width Er
.It Bq Er ZIP_ER_EXISTS
The file specified by
.Ar path
exists and
.Dv ZIP_EXCL
is set.
.It Bq Er ZIP_ER_INCONS
Inconsistencies were found in the file specified by
.Ar path .
This error is often caused by specifying
.Dv ZIP_CHECKCONS
but can also happen without it.
.It Bq Er ZIP_ER_INVAL
The
.Ar path
argument is
.Dv NULL .
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.It Bq Er ZIP_ER_NOENT
The file specified by
.Ar path
does not exist and
.Dv ZIP_CREATE
is not set.
.It Bq Er ZIP_ER_NOZIP
The file specified by
.Ar path
is not a zip archive.
.It Bq Er ZIP_ER_OPEN
The file specified by
.Ar path
could not be opened.
.It Bq Er ZIP_ER_READ
A read error occurred; see
.Va errno
for details.
.It Bq Er ZIP_ER_SEEK
The file specified by
.Ar path
does not allow seeks.
.El
For newly created archives,
.Fn zip_open
does not try to create the file; this is done when calling
.Xr zip_close 3
and any errors, like missing write permissions, will
be reported then.
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_close 3 ,
.Xr zip_error_strerror 3 ,
.Xr zip_fdopen 3
.Sh HISTORY
.Fn zip_open
and
.Fn zip_open_from_source
were added in libzip 1.0.
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at
